With: Kiki Petrosino (Virginia Foundation for the Humanities)

With: David Wiggins (George Mason University)

Most of us have heard of Negro League Baseball, but there were many other all-black sports leagues and teams across America in the 20th century. David Wiggins shares how African-American athletes built their own place for sports in a segregated world.

With: John Kneebone (Virginia Commonwealth University)

An animated, online map shows for the first time just how the Ku Klux Klan spread rapidly to all 50 states between 1915 and 1940. John Kneebone says the KKK was far more mainstream than most people realize, with membership of between 2 million and 8 million people.

With: Jack Censer (George Mason University)

Revolution has been one of the most important drivers of human activity since its emergence in modern form in the 18th century. In his new book, Jack Censer traces the “evolution of revolutionary ideas”–from the American and French revolutionaries to leaders of the Arab Spring.